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#include <iostream>
#include <vector>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    string s1, s2, s3;
    vector<int> n1, n2, n3;
    cin >> s1 >> s2 >> s3;
    for (char c : s1) {
        n1.push_back(c - '0');
    }
    for (char c : s2) {
        n2.push_back(c - '0');
    }
    for (char c : s3) {
        n3.push_back(c - '0');
    }
    int state = -1;
    long long count = 0;
    long long res{};
    for (int i = size(n1) - 1; i >= 0; --i) {
        if (n1[i] + n2[i] == n3[i]) {
            if (state == 0) {
                ++count;
            } else if (state == 1) {
                res += (count + 1) * count / 2;
                count = 1;
                state = 0;
            } else if (state == -1) {
                count = 1;
                state = 0;
            }
        } else if (n1[i] + n2[i] == n3[i] + 10) {
            if (state == 0) {
                state = 1;
            } else if (state == 1) {
                res += (count + 1) * count / 2;
                count = 0;
                state = 1;
            } else if (state == -1) {
                count = 0;
                state = 1;
            }
        } else if (n1[i] + n2[i] + 1 == n3[i]) {
            if (state == 0) {
                res += (count + 1) * count / 2;
                count = 0;
                state = -1;
            } else if (state == 1) {
                state = 0;
                ++count;
            } else if (state == -1) {
                // carry on
            }
        } else if (n1[i] + n2[i] + 1 == n3[i] + 10) {
            if (state == 0) {
                res += (count + 1) * count / 2;
                count = 0;
                state = -1;
            } else if (state == 1) {
                // carry on
            } else if (state == -1) {
                // carry on
            }
        } else {
            if (state != -1) {
                res += (count + 1) * count / 2;
                count = 0;
            }
            state = -1;
        }
    }
    if (state != -1) {
        res += (count + 1) * count / 2;
    }
    cout << res << "\n";
}